function session_info(eid,sid,rid,loc) {
	
	// Defaults for when not all parameters are supplied 
	if (arguments.length == 1) {
		var sid = '';
		var rid = '';
		var loc = '';
	}
	else if (arguments.length == 2) {
		var rid = '';
		var loc = '';
	}
	else if (arguments.length == 3) {
		var rid = '';
	}
	
	mywindow = window.open(
		'/guide/index.cfm?action=session_info'
					+ '&event_id=' + eid
					+ '&region_id=' + rid
					+ '&sid=' + sid
					+ '&loc=' + loc
		, 'margin', 'toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,status=no,resizable=yes,width=650,height=560'
	);
	
}